I can't name 5 breeders, but I might be able to name 5 seed makers.
I have to put OG Raskal as number one, everything I have grown from him has just been a step above everything else I have grown.
Relentless Seeds, grown several of his crosses and they have all been very good, and he seems to try to move from seedmaker to breeder.
Brother's Grimm, the only true breeder I can think of that I would recommend, although he seems to be moving into the seedmaking buisness.
I have grown some of Divine genetics crosses too, and they have all been good.
Spice of life, Vic High (bcsc) and ncga all deserve a spot too, although I dont think any of them are breeding anymore.